Ch. 6 Ct Exam And Anatomy Part. 1 Flashcards
1
Q
Indications Ct exam of the head p 7
A
Trauma, stroke, headache, tumors, endocrine disease, inflammatory disease, and congenital problems
2
Q
Ct exam head _____ slices always required p 7
A
Transverse
3
Q
Ct exam of head requires coronal and sagital slices for p 7
A
Internal auditory canals, temporal bones , pituitary, orbits, sinuses and facial bones
4
Q
Ct of head patient enter gantry p 7
A
Head first supine
5
Q
Two ways obtaining coronal images of head p 7
A
Patient supine and head first Hyperextended patien head and top gantry tilted 20 degrees
Patient prone and head first resting on chin and gantry tilted back 20 degrees
6
Q
Localizer of head ct is what image? P 7
A
Lateral
7
Q
Iv contrast for head ct administered ? P 8
A
Highlight vascular structures of the brain to indicate a disruption of the blood brain barrier
8
Q
Ct exam of brain patient entered gantry p 9
A
Head first and supine
9
Q
Contrast media not admixtures for exam of brain p9
A
Cerebral trauma
Suspected atrophy
Hydrocephalus
Dementia
10
Q
Contrast administered for ct of brain p 9
A
Tumors Abscesses Edema Aneurysm Headaches and seizures
11
Q
Axial slices of brain acquired from the ______ to _____. P 9
A
Skull base
Vertex
12
Q
Typical brain slice thickness reconstruction p 9
A
5mm slices
13
Q
Why thinner slices on ct of brain? P 9
A
Reduce streaks scanning through posterior fossa and pretrous ridges
14
Q
Routine brain scan technique p 10
A
300 ma kvp 120
15
Q
Bone window level of head p 11
A
Width: 2500
Level - 350
16
Q
Posterior fossa window width and level p 11
A
Width: 200
Level: 40
17
Q
Soft tissue of head window width and level p 11
A
Width: 100
Level: 30
18
Q
Ct posterior fossa scan ( skull base) p 16
A
Head first supine scan
Axial slices only
From foramen magnum through the tentorium
19
Q
Posterior fossa scan no contrast medium p 16
A
Cerebral trauma
Suspected atrophy
Hydrocephalus
Dementia
20
Q
Posterior fossa scan contrast administered p 16
A
Tumors Abscesses Edema Aneurysms Headaches Seizures
21
Q
Posterior fossa scan slice thickness p 16
A
1.5-5mm
22
Q
Mas for posterior fossa scan p17
A
300-400 mas
23
Q
Posterior fossa bone detail ww/wl
A
2500 ww and 350 wl
24
Q
Posterior fossa soft tissue window p 16
A
Ww 160 and wl 40
25
I nternal auditory canal / temporal bones contrast exam p 18
Hearing loss to,rule out acoustic neuroma and malignant Ottis externa
26
I nternal auditory canal / temporal bones without contrast p 18
Depict temporal bone , mastoiditis, and cholestatoma
27
Instructions for study of I nternal auditory canal / temporal bones p 18
No swallowing
28
Slices thickness of I nternal auditory canal / temporal bones
0.5-2mm
29
I nternal auditory canal / temporal bones exam covers from? P 18
1cm inferior external auditory canal and superiorly petrous bone
30
Mas used for I nternal auditory canal / temporal bones p 19
200-400 mas
31
I nternal auditory canal / temporal bones technique
200-400 mas
32
I nternal auditory canal / temporal bones standard filter vs sharp filter p 19
Standard - soft tissue
Sharp - High resolution
33
I nternal auditory canal / temporal bones soft tissue window p 20
Ww- 200, wl- 50
34
I nternal auditory canal / temporal bones sharp algorithmn p 20
Ww- 2500
| wl-300
35
Pituitary exam p 22
Head first and supine
Both axial and coronal
Contrast always administered
36
Pituitary exam _____ provide more information because _____ exam causes streak artifacts from dense bone of sella turcica
Coronal
Axial
37
Pituitary slice thickness p 22
0.5-2mm
38
Pituitary axial slices show p 22
Roof of sphenoid sinus through dorsum sella
39
Pituitary Coronal slices show p 22
Anterior clinoid process to dorsum sella
40
Pituitary exam mas p 23
200-400 mas
41
Pituitary soft tissue ww/wl p22
Ww-200
Wl-50
42
Pituitary sharp algorithmn ww/wl p 23
Ww-2500
Wl- 300
43
Orbit exam p 24
Axial and coronal images acquired
Head first and supine
Patient instructed to focus eyes on one thing or close them
44
No contrast media orbit exam p 24
Trauma, foreign bodies, Graves' disease
45
Contrast for orbit exam p 25
Suspected mass in or around eye , visual disturbances, evaluating infection
46
Orbit exam slice thickness p 24
2mm or less
47
Axial images of orbits from p 24
Top maxillary sinus to upper orbital rim
48
Coronal slices orbit exam p 24
Sphenoid sinus to anterior globe
49
_______ images of orbits best demonstrate the relationship between the lens and intraorbital optic nerve
Transverse
50
Orbit exam mas p 26
200
51
Orbit soft tissue ww/wl p 26
Ww-200
Wl- 50
52
Orbit sharp algorithmn p 26
Ww- 2500
Wl- 300
53
Sinuses exam p 29
Both axial and coronal slices
Head first and supine
54
Contrast for sinuses p 29
Suspected mass such as lymphoma or inverted papilloma
55
No contrast for sinus exam p 29
Sinusitis
56
Sinus exam slices p 29
3 mm or less
57
Sinus axial exam from p 29
Hard palate through superior aspect frontal sinus
58
Coronal slices for sinus exam p
Dorsum sella to anterior aspect of frontal sinuses
59
Sinus exam mas p 30
200 mas
60
Sinus soft tissue p 30
Ww- 250
Wl- 50
61
Sharp algorithmn sinus p 31
Ww- 2000
Wl- 300
62
Facial bone exam p 34
Axial or coronal slices
Supine and head first
63
Why no contrast facial bone exam ? P 34
Head trauma
64
Facial bone slice thickness
0.5-3. Mm
65
Facial bone scan coverage ? P 34
Hard palate through superior aspects of cranium
66
Facial bone mas p 34
250
67
Facial bone soft tissue ww/wl p 34
Ww- 300
Wl- 50
68
Facial bone sharp algorithmn ww/wl p 34
Ww- 2500
Wl- 300
69
Tmj scan p 38
Supine head first
Always oblique sagittal scan -
70
Tmj scan done for
Fracture or bony erosion
71
Tmj slice thickness p 38
2mm
72
Tmj mas
250 mas
73
Tmj bone ww/wl
Ww- 2500
Wl- 350
74
Tmj soft tissue window
Ww- 180
Wl- 40
75
Cta is commonly used to evaluate
Intercranial aneurysms and vascular occlusion
76
Cta of brain p 42
Head first and supine
100 ml contrast at rate 4-4.5 ml/sec
Scan 24 secs after start of injection
77
Cta of brain scan from
C2- three quarters of brain
78
Cta brain technique
120 kvp at 250 mas
79
Ct brain perfusion done for ?p 44
Assessment of tissue viability and function after stroke
80
Size gauge needle used for ct brain percussion
Large 16 or 18
81
Ct perfusion contrast flow rate ? P 46
5-8 ml/ sec
82
Ct brain perfusion slice thickness p 46
5mm
83
Ct neck used for p 48
Eval tumors, inflammation, or infection, developmental anaomolies
84
Why contrast in ct neck? P 48
Differentiate boodvessels and vascular tumors from lymph nodes
85
Ct exam neck p 49
Head first supine
Axial slices
Patient instructed stop breathing or refrain swallowing
86
Ct neck row rate
100 ml injected at rate of 3ml/sec with 35 sec delay
87
Ct neck slice thickness
2-5 mm
88
Ct neck technique
120kvp
120 mas
89
Ct larynx p 53
Head first and supine
Phonate "e" to evaluate vocal chord
90
Ct larynx flor rate
100 ml /s rate 3ml per sec with delay 35 sec
91
Ct larynx slice thickness
2mm
92
Ct larynx ww/wl
Ww-300
Wl- 40
93
Cta neck p 55
Head first and supine
Shoulders depressed
94
Cta neck injection p 55
100 ml at rate 4-4.5 ml/ sec with iv in arm opposite of suspected occlusion with 15 sec delay
95
Cta scan through p 55
From aortic arch through sella turcica
96
Cta exam technique p55
120 kvp at 200 mas
97
Cta neck best shows ? P 55
Carotid artery stenosis
98
Why ct of the spine ? P 57
```
Trauma
Intraspinal tumors
Disc herniation
Spinal infection
Spinal stenosis
Metastic disease fractures
```
99
Lateral localizer images for spine allows p 58
Angle slices through each disc space
100
Ap localizer on the spine allows p 58
Guarantees patient spine is straight and allows us to count ribs to locate thoracic spine
101
Why iv contrast of spine ? P 58
Mass is suspected or for evaluation of post surgical spine
102
Ct cervical spine p 59
Head first and supine
Patient refrain from swallowing due to motion
Depress patient shoulders avoid beam hardening artifact
103
Ct cervical contrast used? P 59
Suspected mass
104
Ct cervical slice thickness p 59
2mm overlapping slices
105
Standard ct cervical ww/wl p 59
Ww- 300
Wl- 40
106
Ct cervical sharp ww/wl p 62
Ww- 2000
Wl- 300
107
Ct of T spine p 63
Supine head first
108
Ct of t spine when use contrast? P 63
Suspected mass
109
Ct of t spine slice thickness p 63
2-3 mm
110
T spine standard ww/wl p 64
Ww- 300
Wl- 40
111
T spine sharp ww/wl p 64
Ww- 2000
Wl- 300
112
Ct of L spine p 68
Head first and supine
Wedge under patient legs reduce lordatic curve
113
Ct of L spine contrast when? P 68
Suspected mass
Differentiate scar tissue from recurrent disc disease in post surgical spine
114
Ct of L spine slice thickness p 68
2-3 mm slices
115
Ct L spine standard ww/wl p 70
Ww- 300
Wl- 40
116
Ct of L spine sharp ww/wl p 70
Ww- 2000
Wl - 300
117
Ct myelogram p 73
Contrast introduced into fluid space around spinal chord( subarchnoid space) under Fluor
118
Why ct myelogram p 73
Spinal Chord
Nerve roots
Meninges
Assist pre op planning
119
Ct discogram p 73
Contrast agent directly into suspect pain generating dicsc under Fluro
120
Why discogram p 73
Planning for surgery whether do discectomy or fusion
121
Ct myelogram/ discogram positioning p 73
Supine head first
Head slightly elevated to reduce headache or seizure from contrast
122
Ct myelogram/ discogram slice thickness p 74
2-3 mm slices
123
Ct myelogram/ discogram standard ww/wl p 75
Ww- 300
Wl- 40
124
Ct myelogram/ discogram sharp algorithmn p 75
Ww- 2000
Wl- 300
125
Musculoskeletal ct indications p 76
Lesions
Trauma
Joint spaces
126
Musculoskeletal contrast evals for? P 76
Vascularity of tumors
| Demonstrate major arteries or veins
127
Shoulder ct p 78
Head first supine
External or internal rotation
Opposite arm raised
128
Ct shoulder area of interest p 78
Clavicle through humeral head
129
Shoulder ct slice thickness p 78
1.5-5mm
130
Ct shoulder technique p 78
300 mas
131
Ct shoulder when contrast is used ? P 78
Post arthrogram
132
Elbow ct p 81
Patient supine arm raised palm up
133
Ct elbow slice thickness p 81
0.5-3mm slices
134
Ct elbow soft tissue setting p 83
Ww- 400
Wl- 20
135
Ct elbow bone setting p 83
Ww- 2000
Wl- 350
136
Ct wrist p 84
Head first or supine arm out above head
137
Ct wrist slice thickness p 84
0.5-3mm
138
Ct wrist soft tissue setting p 85
Ww- 400
Wl- 20
139
Ct wrist bone setting p 85
Ww- 2000
Wl- 350
140
Ct hips p 86
Head first or feet first
Toes 15 degree inward
141
Ct hip slice thickness p 86
1.5-5mm
142
Ct hip mas p 86
200-300 mas
143
Ct hip soft tissue p 87
Ww- 400
Wl- 20
144
Ct hip bone setting p 88
Ww- 2000
Wl- 350
145
Ct knee p 88
Feet first or supine with both knees symmetrical to long axis of patient table
If one knee only , center it on table
146
Ct knee slice thickness p 88
0.5-3 mm
147
Ct knee mas p 88
100-200
148
Ct knee soft tissue setting p 89
Ww- 400
Wl- 20
149
Ct knee bone setting p 89
Ww- 2000
Wl- 350
150
Ct ankle/ foot p 90
Feet first and supine
Foot- flat on table
Ankle - legs straight and flexed naturally
151
Ct ankle/ foot slice thickness p 90
0.5-2mm
152
Ct ankle / foot mas p 90
75-200 mas
153
Ct ankle / foot soft tissue setting p 91
Ww- 400
Wl- 20
154
Ct ankle / foot bone setting p 91
Ww- 2000
Wl- 350
155
Ct runoff area of interest p 94
Upper abdomen to below ankles
156
Ct runoff p 96
Feet first and supine
157
Ct runoff contrast p 96
125 ml injected 4 ml/sec with delay 3 mins post injection
158
Ct runoff technique p 96
120 kvp 200 mas
